Originally Posted by tfarney
You have tweaked my curiousity if not yet my system. Do you have any idea what is going on inside the Aphex besides pre-set eq?
No... I don't "have a clue" - I just know it works well... if you're going to use an EQ or SP.
The various reviews, and the Aphex site, go into the "technology of how it works" and provide a pretty good explanation. I just never had the patience to "plod through it all" - and I really don't care... so long as it works... and... it doesn't overly "adulterate" the sound - which it doesn't, if you're careful with it. I pretty much relied on the recommendations of "GreatDane" and the many reviews on the sites like "Musician's Friend," and "Music 1,2,3" by musicians, and engineers - who universally recomended it.
From what I recall... though... it uses a techique that is a very natural technique, that is less likely to create excessive coloration, or distortion, than other techniques... and... provides a better means of controlling the amount of the "correction." But... it improves the sound the moment you engage it - even at "flat" / minimul settings. And its very easy to perform instant A/B comparisons to determine the effects.
But... I don't think I really feel I've needed it, except with the HD650s, which it does an exceptional job of "correcting" - at least the upper mids and highs. I wasn't about to invest "mega-dollars" just to correct them. It makes them sound a whole lot more bright and lively - more like Grados, or ATHs, or Denons. I just decided I preferred other phones (e.g. the modified HD580s, etc.), and sold them - so I don't use it much now. But... I may, if I decide to try the "new" HD650s. Why would I do that? Well... if you can't live without their great bass and mids, then you might... just "have to have the Aphex 204" - the "new" HD650s may well need less "co-rrection" (as "Jeeves said to Nicholson in the Shinning").